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chemistry > npk fertilisers > Flashcards

npk fertilisers Flashcards

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1
Q

what 3 acids are reacted with phosphate rock

A

nitric, sulphuric and phosphoric

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2
Q

what happens when you react phosphoric rock with nitric acid

A

phosphoric acid and calcium nitrate are formed

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3
Q

what further steps have to happen after phosphoric rock has been reacted with nitric acid

A

neutralised with ammonia, produces ammonium phosphate (which can be used as fertiliser)

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4
Q

what happens when you react phosphate rock with sulphuric acid

A

single superphosphate is formed (calcium phosphate & calcium sulphate)

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5
Q

what happens when we react phosphate rock with phosphoric acid

A

triple superphosphate is formed

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6
Q

what differences are there between school and lab production

A

1) school uses lower safer concentrations, industry uses ammonia in gas form
2) school forms crystals with bunsen burner, energy from reaction is used in industry
3) school = batch, industry = continuous

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chemistry (3 decks)

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